ML20069J027

Safety Evaluation Supporting Amends 70 & 75 to Licenses DPR-24 & DPR-27,respectively

ML20069J027
Person / Time
Site:	Point Beach
Issue date:	04/01/1983
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20069J019	List: ML20069J017 ML20069J027 ML20069J030
References
TAC-49033, TAC-49034, NUDOCS 8304120718
Download: ML20069J027 (2)

Text

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UN!TED STATES -

['3w7g NUCLEAR REGULATORY COMMISSION

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%,.....f SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION 4

SUPPORTING AMENDMENT NOS. 70 AND 75 TO FACILITY OPERATING LICENSE NOS. DPR-24 AND DPR-27 WISCONSIN ELECTRIC POWER COMPANY P0' INT BEACH NUCLEAR PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-266 AND 50-301 Introduction By letter dated June 25, 1982 the NRC staff transmitted copies of an Exemption and Safety Evaluation regarding Wisconsin Electric Power Company's (licensee) requested exemption to 10 CFR Part 50 Appendix J.

For denied exemptions, the staff requested that the licensee submit Technical Specifi-cation (TS) changes for Point Beach Units 1 and 2 within 45 days receipt of our evaluation to provide compliance with Appendix J 1eakage testing requirements.

By letter dated August 13, 1982 the licensee req'uested a delay for submission i

of~ proposed TS in order to complete development of a methodology for re-duced pressure testing of containment airlock doors and to await results of an industry study on reduced duration (less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) Type "A" containment integrated leak rate testing. By letter dated October 21, 1982 the licensee submitted proposed TS for containment airlock door testing.

Discussion and Evaluation The licensee's proposed TS changes propose to test the air lock door, "0"-ring seal by drawing a vacuum between the seals and extrapolating the measured leakage to the design pressure. This test would be performed to satisfy the requirement for testing the air lock door seals three days after an air lock opening.

In addition to this test, the air locks would be tested every six months at the design pressure of 60 psig.

t The staff agrees that'the licensee can extrapolate the leakage rate from the vacuum test result to accident pressure, if the following equation is used for the extrapolation:

ma (Pa + Pat)

.(Pat)

=

mt.

(Pat)2

.(pat P}

t i

9304120718 830401 PDR ADOCK 05000266 p

P,DR u.- -

y

-~..-

ca u

I Where:

ma leakage rate at the accident pressure (Pa)

=

mt leakage rate at the vacuum pressure

=

Pa pressure resulting from an accident

=

Pt vacuum pressure of leakage test

=

atmospheric pressure (Reference (1)).

Pat 4

=

i The licensee's proposed testing meets the testing requirements in 10 CFR l

Part 50 Appendix J for airlock door testing. We therefore consider the proposed change acceptable s

Environmental Consideration We have determined that the amendments do not authorize a change in effluent types or total amounts nor an increase in power level and will not result in any significant environmental impact. Having'made this determination, we have further concluded that the amendments involve an action which is insignificant from the standpoint of c

environmental impact and, pursuant to 10 CFR 51.5(d)(4), that an environmental impact statement or negative declaration and environ-mental impact appraisal need not be prepared in connection with the issuance of the amendments.

Conclusion 4

We have concluded, based on the considerations discussed above, that:

(1) because the amendments do not involve a significant increase in the probability or consequences of an accident previously evaluated, do not create the possibility of an accident of a type different from 1

any evaluated previously, and do not involve a significant reduction in a margin of safety, the amendments do not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will-not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of the amendments will not be ir;imical to the common defense and security or to the health and safety of the public.

Date: April 1, 1983 Reference (1) Conversion of Reduced Pressure Air Leakage Measurements to a

Equivalent Full Pressure Air Leakage: July 17,-1980, Dr. G; P. Wachtell, Franklin Research Center Principal Contributors:

P. Hearn, CSD/DSI

~

T.-G. Colburn, ORB #3/DL i

~..n

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